1824.] Scientific Intelligence. 155 



which I am induced to do from not finding it done from higher quar- 

 ters. The observation I wish to make is this, that although we must 

 allow M. Frauenhofer full credit for having first minutely described the 

 position of various dark and bright lines traversing the spectrum, and 

 having employed them as definite points for measuring the dispersion, 

 yet the fact of the existence of such lines has been for some years known, 

 though not, perhaps, so generally as it deserves to be. 1 beg to refer 

 such of your readers as may not be acquainted with it, to a paper by 

 Dr. Wollaston in the Phil. Trans, for 1802, p. 378, in which the exist- 

 ence of such lines under particular circumstances is described as 

 observed by the author. Another observation connected with the 

 same phenomena will be found in p. 380 of the same paper ; and in the 

 same volume, p. 395, in a paper by Dr. Young, an important observa- 

 tion is made, bearing on the theory of the phenomena. 



I am, yours, &c. B. P. 



II. Analysis of Cleavelanditefrom Finland. 

 M. F. Tengstrom finds this substance to be composed of 



Silica 67-99 



Alumina 19*61 



Soda 11-12 



Lime 0-66 



Oxide of manganese 0-4-7 



Oxide of iron 0-23 



100-08 



III. Copper Pyrites of Orijarva. 



M. V. Hartwall. of Abo, has analyzed the copper pyrites of Orijarva, 

 with the following results : 



Sulphur 36-33 



Copper 32-20 



Iron 30-03 



Silica 0-93 



Oxide of mang. and earthy matter. 1-30 



10079 

 The author of this analysis remarks, that its results nearly agree with 

 those given of the copper pyrites of Cornwall, given in the Annals, 

 vol. iii. N. S.p. 300. 



IV. Scapolite from Pargas. 



The last named chemist has also given an analysis of a new species of 

 scapolite from Pargas : it consists of 



Silica 4942 



Alumina 25-4-1 



Lime 1 5'59 



Soda 6-05 



Oxide of iron 1 40 



Magnesia 0'68 



Oxide of manganese 007 



Loss by heat MS 



100-07 



